原标题：Silabs EFM32HG32232位USB MCU开发方案

　　Silabs公司的EFM32HG322是低功耗USB 32位MCU,集成了功能强大的32位ARM Cortex-M0+核,创新的低功耗技术,缩短的叫醒时间和多种可选择的外设.32位处理器工作频率高达25MHz,主要用在能量,气体和水以及智能表,保健和健身应用,智能配件,告警和安全系统,工业和家庭自动化.本文介绍了EFM32HG322主要特性,框图,以及低功耗USB接口Happy Gecko入门套件SLSTK3400A主要特性和电路图.

　　The EFM32 MCUs are the world’s most energy friendly microcontrollers. With a unique combinationof the powerful 32-bit ARM Cortex-M0+, innovative low energy techniques, short wake-up time fromenergy saving modes, and a wide selection of peripherals, the EFM32HG microcontroller is well suitedfor any battery operated application as well as other systems requiring high performance and low-energyconsumption. This section gives a short introduction to each of the modules in general terms and alsoshows a summary of the configuration for the EFM32HG322 devices.

　　EFM32HG322主要特性:

　　• ARM Cortex-M0+ CPU platform

　　• High Performance 32-bit processor @ up to 25 MHz

　　• Wake-up Interrupt Controller

　　• Flexible Energy Management System

　　• 20 nA @ 3 V Shutoff Mode

　　• 0.6 μA @ 3 V Stop Mode, including Power-on Reset, Brown-outDetector, RAM and CPU retention

　　• 0.9 μA @ 3 V Deep Sleep Mode, including RTC with 32.768 kHzoscillator, Power-on Reset, Brown-out Detector, RAM and CPUretention

　　• 53 μA/MHz @ 3 V Sleep Mode

　　• 132 μA/MHz @ 3 V Run Mode, with code executed from flash

　　• 64/32 KB Flash

　　• 8/8 KB RAM

　　• 35 General Purpose I/O pins

　　• Configurable push-pull, open-drain, pull-up/down, input filter, drivestrength

　　• Configurable peripheral I/O locations

　　• 16 asynchronous external interrupts

　　• Output state retention and wake-up from Shutoff Mode

　　• 6 Channel DMA Controller

　　• 6 Channel Peripheral Reflex System (PRS) for autonomous inter-peripheral signaling

　　• Hardware AES with 128-bit keys in 54 cycles

　　• Timers/Counters

　　• 3× 16-bit Timer/Counter

　　• 3×3 Compare/Capture/PWM channels

　　• Dead-Time Insertion on TIMER0

　　• 1× 24-bit Real-Time Counter

　　• 1× 16-bit Pulse Counter

　　• Watchdog Timer with dedicated RC oscillator @ 50 nA

　　• Communication interfaces

　　• 2× Universal Synchronous/Asynchronous Receiver/Transmitter

　　• UART/SPI/SmartCard (ISO 7816)/IrDA/I2S

　　• Triple buffered full/half-duplex operation

　　• Low Energy UART

　　• Autonomous operation with DMA in Deep SleepMode

　　• I2C Interface with SMBus support

　　• Address recognition in Stop Mode

　　• Low Energy Universal Serial Bus (USB) Device

　　• Fully USB 2.0 compliant

　　• On-chip PHY and embedded 5V to 3.3V regulator

　　• Crystal-free operation

　　• Ultra low power precision analog peripherals

　　• 12-bit 1 Msamples/s Analog to Digital Converter

　　• 4 single ended channels/2 differential channels

　　• On-chip temperature sensor

　　• Current Digital to Analog Converter

　　• Selectable current range between 0.05 and 64 uA

　　• 1× Analog Comparator

　　• Capacitive sensing with up to 5 inputs

　　• Supply Voltage Comparator

　　• Ultra efficient Power-on Reset and Brown-Out Detector

　　• Debug Interface

　　• 2-pin Serial Wire Debug interface

　　• Micro Trace Buffer (MTB)

　　• Pre-Programmed USB/UART Bootloader

　　• Temperature range -40 to 85 ºC

　　• Single power supply 1.98 to 3.8 V

　　• TQFP48 package

　　• Preliminary - This datasheet revision applies to a productunder development32-bit

　　EFM32HG322应用:

　　ARM Cortex-M0+, Cortex-M3 and Cortex-M4 microcontrollers for:

　　• Energy, gas, water and smart metering

　　• Health and fitness applications

　　• Smart accessories

　　• Alarm and security systems

　　• Industrial and home automation

　　图1.EFM32HG322框图

　　EFM32™低功耗USB接口Happy Gecko入门套件SLSTK3400A

　　图2.Happy Gecko USB入门板SLSTK3400A外形图

　　Silicon Labs’ low energy SLSTK3400A provides an excellent tool to get familiar with the EFM32™ USB-enabled Happy Gecko 32-bit microcontrollers (MCUs), the industry’s most energy-friendly MCU based on the ARM® Cortex®-M0+ processor.

　　Supported by simplicity Studio, the starter kit contains sensors and peripherals, touch-buttons, LEDs, Si7021 Digital Relative Humidity and Temperature Sensor, memoryLCD and simplicity header, demonstrating some of the MCU’s many capabilities and can serve as a starting point for application development. The SLSTK3400A includes AEM (Advanced Energy Monitoring) and the Energy Profiler capabilities allowing real-time energy profiling of your application. This kit has two AEM-channels, one for measuring the current consumption in self-powered mode, and one for monitoring the VBUS-current when the chip is USB-powered.

　　SLSTK3400A主要特性:

　　EFM32HG322F64 with 64 kB Flash and 8 kB RAM

　　Advanced Energy Monitoring system for precise current tracking

　　Real-time energy and power profiling

　　Integrated SEGGER J-Link USB debugger/emulator with debug out functionality

　　Can be used as stand-alone debugger/emulator

　　128x128 Pixel Memory LCD

　　20 pin expansion header

　　Breakout pads for easy access to I/O pins

　　Power sources (USB and CR2032 battery)

　　2 user buttons, 2 user LEDs and 2 touch buttons

　　Silicon Labs Si7021 Relative Humidity/Temperature sensor

　　EFM32 OPAMP footprint

　　32 MB NAND flash

　　USB device interface

　　Supported by Simplicity Studio